Performance of x-ray imaging systems with optical coupling for demagnification between scintillator and CCD readout

Hans Roehrig; Tong Yu; William V. Schempp

doi:10.1117/12.193177

11 November 1994 Performance of x-ray imaging systems with optical coupling for demagnification between scintillator and CCD readout

Hans Roehrig, Tong Yu, William V. Schempp

Author Affiliations +

Proceedings Volume 2279, Advances in Multilayer and Grazing Incidence X-Ray/EUV/FUV Optics; (1994) https://doi.org/10.1117/12.193177
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

This paper discusses the performance of x-ray imaging devices employing optical coupling between the x-ray detector (phosphor screen) and the readout (CCD). Optical coupling can be performed with the aid of a lens or with the aid of a fiber-optic taper. Conventional wisdom predicts that fiber-optic coupling is superior on account of superior light collection efficiency. For the same demagnification, fiber-optic tapers usually have a higher numerical aperture in the object plane than a lens. This paper presents a review of critical imaging system components and provides a comparison of factors such as light collection efficiency, phosphor screen light output and CCD sensitivity. The paper presents data obtained with two commercially available x-ray imaging systems, one a lens coupled system, the other a fiber- optically coupled system. These systems are used for mammographically guided stereotactic breast biopsy to determine the x-, y-, and z-coordinates of the lesion to be biopsied. The paper concludes that a lens coupled x-ray imaging system can be superior to a fiber-optic one, particularly with respect to Detective Quantum Efficiency. This superiority is based on a quantum gain of about 5 CCD electrons per absorbed x-ray photon, which is (however barely) sufficient to preserve most of the information collected by the system's Lanex screen.

Citation Download Citation

Hans Roehrig, Tong Yu, and William V. Schempp "Performance of x-ray imaging systems with optical coupling for demagnification between scintillator and CCD readout", Proc. SPIE 2279, Advances in Multilayer and Grazing Incidence X-Ray/EUV/FUV Optics, (11 November 1994); https://doi.org/10.1117/12.193177

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